1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 269Get this manual
1301 31Pressure and vacuum test the gearcase as follows:
INotel Pressure and vacuum test gearcase before filling Remove the drain plug and screw in pressure test gauge Pump pressure up to 3-6 psi (21 -42 kPa)If pressure gauge indicates leakage, submerge the gearcase in water to determine source of leakage as evidenced by bubblesIf the gearcase pressure gauge does not indicate leakage, increase pressure to 16-18 psi (110-124 kPa)If pressure does not hold, submerge the gearcase in water and check for source of leakageMake necessary repairs and repeat test Screw in vacuum testerPump out to 3-5 in(76-127 mm) of mercury and see if vacuum holdsThen, pump out to 15 in(381 mm) of mercury and checkIf the gearcase fails to hold on either test, put oil around suspected sealIf leak then stops or oil is drawn in, that seal is defectiveWhen the gearcase checks OK, refill with the proper lubricantrJ1l 32Fill the gearcase with lubricant as follows: Secure the gearcase in an upright position Remove the oil level plug and the oil filldrain plugReplace the seals if damaged Fill the gearcase with OMC Hi-Vis gearcase lube until lubricant appears at the oil level holeInsert the oil level plug firstInstall the filldrain plugTighten the oil level plug and filldrain plug to torque of 60-84 inIbs(7-9 Nm)Be sure the plug with the magnet is installed in its original position Inspect the gearcase oil level after motor test has been performedCOA3148